We report the discovery of a non-conventional {112¯2} twinning mechanism in α-titanium through reversible α→ ω → α martensitic phase transformations. Specifically, parent α-phase first transforms into an intermediate ω-phase, which then quickly twin α-phase, leading to formation contraction twins. In addition, we prove that transformations follow strict orientation relations between α-, ω-, and...

The sp3 C–H acetoxylation at the β-position of α,α-disubstituted α-amino acids proceeds smoothly under palladium catalysis in presence PhI(OAc)2. This reaction provides a straightforward synthetic route to non-natural β-acetoxy-α-amino acids. α-aminocyclopropanecarboxylic acid takes place via ring-opening selectively afford an acyclic γ-acetoxy-α,β-unsaturated amino acid.